Transactions with Affiliates - Equipment Purchases and Sales Table (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Related Party Transaction [Line Items]
Partners’ capital adjustment	$ 4,726	$ (43)	[1]
Western Gas Partners, LP [Member] | Affiliates [Member] | Purchases [Member]
Related Party Transaction [Line Items]
Cash consideration - purchases	9,968	4,702
Net carrying value	4,908	4,745
Partners’ capital adjustment	5,060	(43)
Western Gas Partners, LP [Member] | Affiliates [Member] | Sales [Member]
Related Party Transaction [Line Items]
Cash consideration - sales	700	0
Net carrying value	366	0
Partners’ capital adjustment	$ (334)	$ 0

[1] Financial information has been recast to include the financial position and results attributable to the DBJV system. See Note 1 and Note 2.